We booked through Dexter’s Fantasea Tours. They did not disappoint. Fun excursion! All transportation back/forth included. We were on their 40×22 ft Trimaran. They allowed (and encouraged) us to take pictures with our own camera, and they even took pics of us with our own camera as well (no charge!). For what we paid ($40/adult, $30/child, Infant Free), it was well worth it!
7-mile beach
On another visit to Grand Cayman, we took a taxi ($4/person) to Royal Palms Beach Club, where we paid the $2/person entrance fee, which gave us access to their property, beach, pool, restrooms, showers. We rented an umbrella and chairs. Didn’t need a cabana. Beautiful beach when the weather turned on us. Thankfully we had rain ponchos 🙂